// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init({ env: cloud.DYNAMIC_CURRENT_ENV }) // 使用当前云环境

// 云函数入口函数
exports.main = async (event, context) => {
  const wxContext = cloud.getWXContext()

  const receiverId = event.receiverId;
  const senderId = event.senderId;

  const _ = cloud.database().command;
  return await cloud.database().collection('chat_message').where( 
    _.or([
      {
        receiverId: receiverId,
        senderId:   senderId
      }, 
      {
        receiverId: senderId,
        senderId:   receiverId
      }
    ])).get();
}